Let $\mathcal{F}$ be the family of all $k$-element subsets of $[n]$. What is the smallest $\ell$ such that we can partition $\mathcal{F}$ into $\ell$ families $F_1,\dots,F_\ell$ with the property that none of the $F_i$ contains two sets that intersect in **at most two** elements? 

Of course, one can generalize this question to intersections of size at most $r$, but I couldn't even figure out this "simple" case.
If no such lower bound is known, are there related problems I could look into?

__Update:__ As pointed out in the comments, this is related to the the chromatic number of the generalized Kneser graph. 

__Update 2:__ Does finding such a lower bound become any easier if we assume $\mathcal{F}$ contains *all* subsets of $[n]$? (Of course, this assumption implies a trivial lower bound of ${n \choose 2} + n$ but is there anything better?)